Clamp.



PATBNTBD. EEB; 17, 190s.'

B. C. KARL.

ULAMP.

APPLIcATwN FILED ma. 5, 1902.v

H0 MODEL. I

UNITED STATES' PATENT OEEICE,

EDUARD C. KARL, OF HAWTHORNE, CONNECTICUT.

CLAMP.

SPECIFICATION forming part of Letters Patent No. 729,816, dated February17, 1903. Application led March 5, 1902. Serial No. 96,792. (No model.)

To al?, whom, t mja/y concern; v

Beit known that I, EDUA'RD O. KARL, a citizen of the United States,residing at Hawthorne, in the county of Fairlield and State ofConnecticut, have invented an Improvement in Clamps Employed in theManufacture of Staved Columns or Pillars, of which the following is aspecification.

My invention relates to a device Afor drawing together and holding undergreat pres-y sure the staves of Wooden columns or pillars while the glueis setting. Devices having .this object in View have heretofore beenemployed; but the same have been more or less inefficient andunsatisfactory. In carrying out my invention I employ tubular metalbodywith a forked edge at one end and an interior screw-thread at theother end, a sleeve surrounding this body and having pins engagingperforations in one end of an encircling strap of metal, the other endof which strap is secured to the jaw, and I employ a screwstem andoperating hand-wheel, with a nut on the screw-stemj within the end ofthe sleeve. I prefer to employ screws and prongs forming parts of thejaw and which enter the wood of the column or pillar and serve toconnect the clamping device temporarily thereto, and one end of theencircling 4strap is connected to the jaw, and after passing the straparound the column the perforations therein are passed over the aforesaidpins and the screw-stem operated by the handwheel to draw the sleevelongitudinally-of the tubular body, so as to put a strain on the strapand apply a great pressure to draw together the staves of the column orpillar and hold the same while the glue is drying.

In the drawings, Figure 1 is a longitudinal section of the clamp deviceand a cross-section of the column or pillar; Fig. 2 is a plan of theclamp device alone. Fig. 3 is an end View of the same. Fig. e is across-'section and end elevation through the jaw portion of the clamp,and Fig. 5 is a cross-section at c a: of Fig. 1.

The wooden column or pillar is formed in the usual manner well known inthe art of the staves 0., which run lengthwise of the column and whichare provided with substantially parallel surfaces or sides and bevelededges, the beveled edges being on radial lines from the imaginary axisof the column and at inclinations proportioned tothe number of sectionscomposing the column. I have shown these staves as provided withsliptongues b and which are the equivalent of Van ordinary tongue andgroove, both of which structures are Well known in the art.

The clamp device comprises the following parts: A tubular body of metalc is provided at one end with an interior screw-thread 2 and at theother end with a jaw d, forked by a central space, so as to provideprojecting ingers 3. The ends of these fingers are preferably providedwith serrated points or teeth, so as to stick into the wood of thecolumn, and I employ screws 4, which pass through the lingers and atright angles to the axis of the tubular body and which screws simplyrotate, having heads at the top,with concave sides and of the shapeshown, and a nut upon the under sideof the fin gers, so as to preventlongitudinal movement of the screws `the' points of which are adapted topenetrate the wood of the column. These screws can be started in thewood by a hammer and turned by the ngers. I further provide the undersurface of the jaw edges inclined .to the tubular body with prongs 5,and there is a roller 6 on a suitable axis extending across the jawbetween the fingers 3. A sleeve of metal e, closed at one end, exceptfor an aperture, surrounds the tubular metal body o. The screw-stem fpasses through the aperture of' this sleeve into the tubular body, thethreads thereof engaging the interior threads of the tubular body. Thissleeve is provided with pins 7 in line and at regular spaced-apartintervals, and upon the interiorof the sleeve and longitudinally thereofis a rib 8, fitting a groove 9 in the outer surface of the tubular bodyc, said rib and groove permitting longitudinal movement of the partswith reference to one another, but preventing rotation. The rib 8 is inline with the pins 7 and increases the thickness of metal and consequentbearing for the pins. A nut 10 is secured upon the screwstem f by a pinor suitable device, so

that the same is fixed to the stem fand comes against the inner surfaceat the end of the sleeve e, and when the ypartsare in the position shownin Fig. 1 the nut is between the sleeve and the end of the tubular bodyc. On

the outer end of the stem f is a hand-wheel g, preferably keyed theretoand employed as a device for rotating the screw-stem f. A band of metalh is at one end bent around the jaw d, as shown in Figs. l, 2, and 3,and is secured thereto by the screws 11, the other end of the band ofmetal being provided with equidistant spaced-apart perforations whichagree with the distances apart of the pins 7. This band passes betweenthe fingers 3 of the jaw and beneath the roller 6.

In the operation of the clamping device hereinbefore described thescrews 4 and the prongs 5 are driven into the wood of the column orpillar and the band h passed around the pillar between the fingers 3 andbeneath the roller 6, and with the parts in the position shown in Fig. lthe pins 7 are passed into the perforations of the band, so that theband is held to the sleeve c. The hand-Wheel g and screw-stemf are nowrotated and the sleeve moved longitudinally of the tubular body, drawingupon and straining the band in a line substantially tangential to itscircumference and compressing and holding together the staves of thecolumn or pillar with force, putting the same under great pressure. Anynumber of these clamping devices are to be employed, as required in thelength of the column, and the parts are left in the strained positionuntil after the glue is set, when the band is slackened by turning thehand-wheel and screw-stem in the opposite direction sufficient touncouple the band from the pins and remove the device from the column.

I prefer to employ a washer l2, of brass, be-l tween the nut l0 and theinner surface of the sleeve e to reduce the friction and permit the nut10 to turn freely in rotating the stem f.

I claim as my inventionl. In a clamping device, they combination with anencircling band, of a body portion having an inclined end to which oneend of the band is secured, a longitudinally-movable part upon the bodyportion to which the other end of the band may be secured, and means formoving the one part in relation to the other to draw upon and strain theband tangentially to the circumferential outline thereof and applypressure in use, substantially as specified.

2. In a clamping device, the combination with an encircling band ofmetal, of a tubular body having a jaw at one end and to which one end ofthe band is secured, a sleeve surrounding` the tubular body and meansconnected therewith to which the other or free end of the band may beconnected, a screwstem engaging the tubular body and acting against themovable part when rotated to effect a longitudinal movement thereof instraining the band, substantially as specified.

3. In a clamping device and in combination, a tubular body of metalhaving an interior screw-thread at one end and a jaw at the other end,an encircling band of metal secured at one end to said jaw, a sleevesurrounding the tubular body and spaced-apart pins 7 connected in linetherewith, a screw-stem passing into the tubular body and through anaperture in one end. of the sleeve, a nut upon the screw-stem within thesleeve, and a hand-wheel for rotating the screw-stem outside of thesleeve, substantially as set forth.

4E. Inaclampingdeviceandincombination, a tubular body of metal having aninterior screw-thread at one end, a jaw at the 'other end, fingers 3formed as continuations of the jaw and providing a central aperture, aroller extending between the fingers across the apertn re and above thesurface of the jaw, screws passing through the lingers and projectionson the surface of the jaw, a sleeve surrounding the tubular body, a lineof equal spacedapart pins '7 in the sleeve, a screw-stem passing intothe tubular body and engaging the interior threads thereof, a nut uponthe stem within the sleeve, a hand-wheel on the end of the stem outsideof the sleeve, au encircling band of metal bent around the end of thejaw and secured thereto and having in its free end a line ofperforations agreeing with the pins 7 of the sleeve and engaging thesame, substantially as and for the purposes set forth.

5. In a clamping device and in combination, a tubular body of metalhaving an interior screw-thread atene end,a jaw at the other end and alongitudinal surface groove, an encircling band of metal secured at oneend to said jaw, devices for engaging Wood connected with the jaw, asleeve surrounding the tubular body and having a longitudinal internalrib fitting the groove of the tubular body, and spaced-apart pins 7connected in line therewith and passing through the body at theincreased thickness provided by the rib, a screw-stem passing into thetubular body and through an aperture in one end of the sleeve, a nutupon the screw-stem within the sleeve, and a hand-wheel for rotating thescrew-stem outside of the sleeve,substantially as set forth.

Signed by me this 1st day of March, 1902.

EDUARD C. KARL. Witnesses:

GEO. T. PINCKNEY, BERTHA M. ALLEN.

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